Can't Play Offline

Alrighty, I’ve been playing starcraft and starcraft 2 since I was a wee lad, and I remember how it used to give me the option to sign in or play offline. Now, I’m unable to open the game in any capacity without an email address, since everything goes through the battle.net launcher now. Battle.net refuses to open the game, stating that I need to be up to date, even though I already am. I’ve tried using every launcher in the source folder, and even tried the many methods from this thread

I’ve been troubleshooting this for several hours now with no degree of success, is there any way I could get some help?